David blackbubjsr



UNITED STATES PATENT OFFICE,

DAVID BLACKBURN, 0E MONTREAL, QUEBEC, CANADA.

WATERPROOFING COMPOUND.

SPECIFICATION forming part of Letters Patent No. 327,514, dated October 6, 1885.

Application filed April 16. 1885. Serial No. 162,470. (No specimens Patented in Canada March 26, 1885, No 21,328.

To all whom it may concern:

Be it known that I, DAVID BLACKBURN, of the cityof Montreal, in the District of Montreal and Province of Quebec, in the Dominion of Canada, have invented a certain new and useful Improvement in Waterproofing Oompounds; and I do hereby declare that the following is a full, clear, and eY-ct description of the same.

The object of my invention is to produce a compound which shall be thoroughly efficient for rendering canvas, cotton, linen, cloths, and other textile fabrics impervious to water, and which shall consist of cheap and readilyobtainable ingredients, easily mixed, and applied in a simple manner.

My compound consists of glue, soap, flour, salt, and water mixed in the following manner: I take two gallons of soft water and heat same to about the boiling-point, and then add three-quarters of a pound of glue, (either in solid form, or as size, or' part solid and part size,) and when same has dissolved I then add one-half pound of good bar-soap previously cut into small pieces or shavings, and one pound of flour and one-quarter pound of salt, and allow the same to simmer long enough to insurethe thorough dissolution and admixture of the ingredients. The admixture may be facilitated by stirring, if desired, and in most cases it will be found pre a e ti allow a short interval of time after the insertion of each ingredient, so as to allow thorough incorporation before adding the next ingredient. Any scum which may then have accumulated is removed, and the compound bottled while warm.

The above are the proper proportions to make sufficient of my compound to render water-proof a fabric of about live yards long by twenty-nine inches wide.

In using the compound it will be well warmed, so as to allow it to flow easily, and then applied with a brush to one or both sides of the fabric, as desired, in one or more coats. \Vith most fabricssuch as canvas and the likeit will be found desirable to treat itfil'st with alum-water of about the proportion of four gallons of water to one pound of alum, as it is well known that this will kill any grease and draw the mesh tightly together.

After my waterproofing compound has been applied and the fabric dried the surface may be again hardened and set by washing it with the alum solution; or the same effect may be produced by giving the material one or more coats of paint mixed with oil.

What I claim is The waterproofing compound composed of glue, soap, flour, salt, and water in substantially the proportions specified.

DAVID BLACKBURN.

lVitnesses:

OWEN W. EvANs, ARTHUR HARRIS. 

